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Fig. 2. Effect of (a) cumulative soil heat units and (b) cumulative nitrification heat units in the fall on the percentage of recovered fertilizer N, with and without NBPT and DCD, as NH₄⁺ using the final fall sampling period only [*, **, *** indicate significance at P = 0.05, 0.01, and 0.001, respectively; slope comparison: (a) P = 0.069 (not significant); (b) P = 0.02*].

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